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CS8312
CS8312
IGBT Ignition Predriver with Dynamic Current Regulation
Description
The CS8312 is a bipolar microprocessor interface IC designed to drive an IGBT (or logic level MOSFETs) powering large inductive loads in harsh operating environments. The ICOs dynamic current limit function lets the microprocessor adjust the current limit threshold to the real time needs of the system. CLI, the current limit input, sets the current limit for the IGBT high or low as directed by the system microprocessor. CLI also raises and lowers the threshold on the diagnostic FLAG output signal. The FLAG output signals the microprocessor when the current level approaches current limit on the IGBT. The CTRL input enables the FLAG function.
Features
s P Compatible Inputs s Adjustable Current Limit Thresholds s External Sense Resistor s Flag Signal to Indicate Output Status
Absolute Maximum Ratings Supply Voltage.................................................................................-0.3V to +12V Digital Input Currents....................................................................................2mA Internal Power Dissipation (TA = 25C) .................................................700mW Junction Temperature Range.....................................................-40C to +150C Storage Temperature Range ......................................................-55C to +165C Lead Temperature Soldering Wave Solder(through hole styles only).............10 sec. max, 260C peak Reflow (SMD styles only).............60 sec. max above 183C, 230C peak Electrostatic Discharge (Human Body Model) ............................................2kV
Package Options
8L PDIP & SO Narrow
FLAG 1 SENSE+ VCC CTRL CLI OUT
Block Diagram
VCC
CTRL
VT
Control Logic
Gate Driver
OUT
SENSE Gnd
FLAG Latch
VT
SENSE+
VREF
Gnd
CLI
SENSE
Cherry Semiconductor Corporation 2000 South County Trail, East Greenwich, RI 02818 Tel: (401)885-3600 Fax: (401)885-5786 Email: info@cherry-semi.com Web Site: www.cherry-semi.com
Rev. 4/7/97
1
A
Company
CS8312
Electrical Characteristics 7V VCC 10V; -40C TA +125C; unless otherwise specified
PARAMETER TEST CONDITIONS MIN TYP MAX UNIT
s General Power Supply including Ripple Voltage Supply Ripple Frequency Differential Ground Voltage Differential Ground Frequency Quiescent Current, IQ Turn On Turn Off Supply Voltage Rejection Differential Ground Rejection Ratio Differential Ground Current Ratio Unity Gain Bandwidth Clamp Voltage Output Off Voltage Turn On Delay Turn Off Delay s Control Function Input Voltage Range Input Threshold Turn On Turn Off Hysteresis Voltage Input Capacitance
7 10 -0.1 -0.2 10
10 60 1.0 0.6 60 15 5
V kHz V V kHz mA mA dB dB mA
DC SENSE- to Gnd AC SENSE- to Gnd
VCTRL=5.5V VCTRL=-0.3V VCTRL=5.5V VCTRL=5.5V VCTRL= -0.3V (VSENSE--VGnd)DC=1V (VSENSE--VGnd)AC=0.6V VCTRL=5.5V VCTRL=5.5V; IOUT=1mA VCTRL=-0.3V; IOUT=10A VCTRL=-0.3V; IOUT=200A CTRL increasing CTRL decreasing
30 30 3
400 5.5 0.5 1.2 30 30
kHz V V V us us
ICTRL=2mA CTRL increasing CTRL decreasing ICTRL=10A MAX
-0.3
5.5 3.5
V V V V V pF
1.5 0.4
2.0 1.1 50
s Current Limit Increase Function Input Voltage Range ICTRL=2mA Input Threshold Turn On Turn Off Hysteresis Voltage Input Capacitance s Output Stage IOUT s Flag Function Output Low Leakage Current Output Capacitance Turn On (VSENSE+ VSENSE-) CLI increasing CLI decreasing ICLI=10A max
-0.3
5.5 3.5
V V V V V pF
1.5 0.4
2.0 1.1 50
5
mA
VCTRL=5.5V; IFLAG=1.5mA VCTRL=-0.3V VCTRL=5.5V; VCLI=-0.3V VCTRL=5.5V; VCLI=5.5V 2 210 300 225
0.9 10 50 240 350
V A pF mV mV
CS8312
Electrical Characteristics continued
PARAMETER TEST CONDITIONS MIN TYP MAX UNIT
s Flag Function: continued Turn Off Delay Turn On Delay Disable Time s Sense Function Input Voltage Range Sense Regulation Voltage Input Leakage Current Propagation Delay
CTRL decreasing 100
10 10 450
us us us
VCTRL=5.5V; VCLI=-0.3V VCTRL=5.5V; VCLI=5.5V VCTRL=5.5V VCTRL=5.5V
-0.3 270 380
295 410
2.5 320 440 5 20
V mV mV A us
Package Pin Description
PACKAGE PIN # PIN SYMBOL FUNCTION
8L PDIP & SO 1 2 3 4 5 6 7 8 FLAG SENSE+ SENSE Gnd OUT CLI CTRL VCC Indicates whether current through the IGBT has reached a preset level. Positive input to current comparator. Ground (SENSE-) for current sense resistor. Ground connection. Output voltage to IGBT (MOSFET) gate. Current limit input increase. Control input. Supply voltage. Circuit Description
Flag Function (see Application Diagram) Output Stage
The flag indicates when the voltage across the two sense pins is approaching a current limit level that has been determined by the value of the external sense resistor (RSENSE) and the state of the CTRL and CLI pins. If the voltage across the sense pins (SENSE+, SENSE-) is less than the flag turn-on voltage, then the FLAG is off. When the voltage between the sense pins equals the FLAG turn on voltage, the FLAG will latch on until the CTRL pin goes low. FLAG is disabled whenever CTRL is low. Changing the CLI pin from low to high will increase nominal FLAG turn on voltage by approximately 45%. Table 1 FLAG Timing Sequence
State 0 1 2 3 0 CONTROL Low High High High Low SENSE+ X Below Threshold Above Threshold X X FLAG OFF OFF ON ON OFF
The CS8312 output (OUT) saturates and supplies voltage to the IGBT (or MOSFET) gate once the CTRL switches from low to high. As current through the IGBT (MOSFET) increases and the voltage across the sense resistor passes the flag turn on voltage, the FLAG will turn on. If the current through the sense resistor continues to rise and the sense resistor voltage reaches the regulation sense voltage, then the gate voltage will fall to a level that regulates the driver and maintains the regulation sense voltage at the sense resistor.
Current Limit Function
Changing the CLI pin from a logic low to a logic high increases the FLAG turn on voltage by approximately 45% and the regulation sense voltage by approximately 39% respectively.
3
CS8312
Application and Test Diagram
VCC
VBA
T
LOAD 0.1mF VCC VCC OUT R
CS8312
FLAG CTRL CLI SENSE+ RSENSE SENSE Gnd
Microprocessor
4
CS8312
Package Specification
PACKAGE DIMENSIONS IN mm (INCHES) PACKAGE THERMAL DATA
D Lead Count 8 Lead SO Narrow 8 Lead PDIP Metric Max Min 5.00 4.80 10.16 9.02 English Max Min .197 .189 .400 .355
Thermal Data RQJC RQJA typ typ
8L SO 45 165
8L PDIP 52 100 uC/W uC/W
Surface Mount Narrow Body (D); 150 mil wide
4.00 (.157) 3.80 (.150)
6.20 (.244) 5.80 (.228)
0.51 (.020) 0.33 (.013)
1.27 (.050) BSC
1.75 (.069) MAX 1.57 (.062) 1.37 (.054) 1.27 (.050) 0.40 (.016) 0.25 (.010) 0.19 (.008) D REF: JEDEC MS-012
0.25 (0.10) 0.10 (.004)
Plastic DIP (N); 300 mil wide
7.11 (.280) 6.10 (.240)
8.26 (.325) 7.62 (.300) 3.68 (.145) 2.92 (.115)
1.77 (.070) 1.14 (.045)
2.54 (.100) BSC
.356 (.014) .203 (.008)
0.39 (.015) MIN. .558 (.022) .356 (.014) Some 8 and 16 lead packages may have 1/2 lead at the end of the package. All specs are the same.
REF: JEDEC MS-001
D
Ordering Information
Part Number CS8312YN8 CS8312YD8 CS8312YDR8
Rev. 4/7/97
Description 8L PDIP 8L SO Narrow 8L SO Narrow (tape & reel) 5
Cherry Semiconductor Corporation reserves the right to make changes to the specifications without notice. Please contact Cherry Semiconductor Corporation for the latest available information.
(c) 1999 Cherry Semiconductor Corporation

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